Automatic switch



Jung 21 1927 w. EDWARDS AUTOMATIC SWITCH Filed Feb. 19, 1925 ATTORNEY Patented June, 21, 1927.

UNITED STATES WILLIAM EDWARDS, F ROCK SPRINGS, WYOMING.

AUTOMATIC SWITCH.

Application led February 19, 1925. Serial No. 10,395.

This invention relates to an automatically operated switch which will automatically break an electric circuit when pressure in a device reduces to a low point, the genera'l object ofthe invention being to provide an expansible chamber which is in communication with the oiling system of an internal combustion motor and which is attached to a switch'located in the ignition circuit so that the circuit will be broken when the pressure in the oiling system drops to a dangerous low point and thus prevent damage to the motor.

Another object of the invention is to provide means whereby the motor can be initially supplied with current while the au- "tomatic switch is open` so as to cause the oil pressure toclose said switch and then to connect the circuit in which the automatic switch is located with the ignition circuit.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim.

In describing my invention in detail, referencel will Abe had to the accompanying drawings wherein like characters denote like or correspondin parts throughout the several views, and 1n which:-

Figure 1 is a sectional view through the device. p5 `Figure 2 is a view taken at right angles to Figure 1 with parts in section and parts in elevation. t,

Figure 3 is a section on line 3 3 of Figure 2.

Figure 4 is a diagrammatic view-0f the circuit.

In these views, 1 indicates a housing in which is located an expansible member 2 which forms a chamber which is adapted to 5 be connected with the oil system of an internal combustion motor by the pipe 3 so that said chamber will be supplied with oil from the system when the oil pump is in operation. The inner end of the member 2 is o provided with a threaded socket 4 to receive one end of the threaded stem 5 which passes into a switch housing 6 arranged in the casing 1. A switch member 7 is carried by a nut 8 on the stem 5 and the switch terminals 5 :9 are carried by the housing 6 and the conductors 10 and 11 are connected `with these terminals and pass-through the end of the casing 1, one terminal being connected wit-h the motor or other device which is shown at A in Figure 4 and the yconductor 10 being connected with a terminal 12 which is adapted to be engaged by a switch 13 which is connected with the source of supply, shown at B. A terminal 14 is connected with the member 2 will expand the same and thus hold the switch 7 in engagement with the terminals 8 so that the circuit to the member A will be closed as long as the switch 13 is in engagement with the terminal 12. If the pump should cease to operate or aleak occur in the line or the oil level become low the pressure in member 2 would be reduced so that said member would be contracted by the spring 16 and thus the switch would be separated from the terminals 9 and thus the circuitto the member A would be broken so that said member would cease to function. This would prevent damage to the member A through lack of lubricant. In starting the motor or member A the switch 13 is placed in engagement with the terminal 14 so as to supply current to the member A while the automatic switch 7 is in automatic position but as soon as the motor or member A is in actuation and the oil pump is working the switch 13 is moved into engagement with the terminal 12 so that the ignition current must ass through the automatic switch and t us when the switch is moved to open position the ignition circuit will be broken. I provide nuts 18 on the stem 5 which act as an adjustable stop for limiting the expansion movement of the member 2.

It is thought from the foregoing description that the `advantages and novel features of my invention will be readily apparent.

I desire it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such chan es fall with- 1n the scope of the appended c aim.

What I claim is A device of the class described including a housing, an expansible member arranged within the housing and forming a chamber which is adapted to be placed in communication with the oiling system of un internal combustion motor, a switch housing in the main housing in alignment with an expansible member. a threaded socket on one end of thc expansble member, a threaded stem movable through one end of the switch housing and udjustubly connected to the socket, nuts adjustable on the stem und disposed between the switch housing and the threaded socket for adjusting the limit of movement of the expansible member, a flexible switch member adjustable on the stem Within the switch housing, oppositely disposed contacts carried by the switch housing and arranged upon opposite sides of the switch member und u coil spring mounted upon the stem within the switch housing and disposed upon one end of the main housing and the switch member whereby to normally retain the expunsihle member in a eontractive position and the switch member out of engagement with the contacts.

In testimony whereof I aiix my signature.

YVILLIAM EDWARDS. 

